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用双剪法对小浪底砂岩在摩擦滑动中的电阻率变化进行了实验研究。结果表明,在摩擦滑动过程中,电阻率“趋势”变化有明显的方向性效应,在不同的测量方位上显示出较大的差异性和不同的前兆特征。平行于断层面的第Ⅰ道电阻率持续上升,大滑动前无明显异常反应;垂直横跨断层面两侧的第Ⅱ道随剪应力的增大电阻率由开始大幅度下降转为平稳变化,大滑动前出现清晰的突变异常,其幅值达50%左右;与断层面斜突成45°夹角的第Ⅲ道随剪应力的增大电阻率缓慢上升,达到某一极值后随块体的滑动转为下降。最后,本文简单地讨论了产生这些差异性现象的可能原因及其在地震预报中的应用。
The shear resistivity of Xiaolangdi sandstone during frictional sliding was experimentally studied by double shear method. The results show that during the frictional sliding process, the resistivity “trend” has a significant directional effect and shows great differences and different precursor features in different measurement orientations. The resistivity of the first lanes parallel to the fault surface continued to rise, and no obvious anomalous reaction occurred before the large slides. The resistivity of the second lanes perpendicular to the fault plane changed greatly from the beginning to the stable change, A clear anomaly appeared before large slip with an amplitude of about 50%. With the increase of shear stress, the resistivity increased slowly with the increase of shear stress at the angle of 45 ° with the bevel of the fault plane. With the increase of shear stress, Sliding body to decline. Finally, the paper briefly discusses the possible causes of these differences and their applications in earthquake prediction.